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Una supernova de tipo Ia en el corazón del superluminoso SN 2006gy
Anders Jerkstrand1,2, Keiichi Maeda3,4, Koji S Kawabata5
1Max Planck Institute for Astrophysics, Karl-Schwarzschild-Straße 1, 85748 Garching, Germany. anders.jerkstrand@astro.su.se.
Science (New York, N.Y.)
|January 25, 2020
Resumen
Las supernovas superluminosas, como SN 2006gy, pueden ser el resultado de una supernova estándar de tipo Ia que interactúa con el material circunstelar. Esta interacción puede explicar la salida de energía extrema y los espectros ricos en hierro observados en estas explosiones cósmicas.
Área de la Ciencia:
- La astrofísica
- Las explosiones cósmicas
- Evolución estelar
Sus antecedentes:
- Las supernovas superluminosas (SLSNe) exhiben salidas de energía hasta 100 veces mayores que las supernovas normales.
- Los progenitores y las fuentes de energía de SLSNe siguen siendo poco conocidos.
- SN 2006gy es un ejemplo notable de un SLSN con características espectrales inusuales.
Objetivo del estudio:
- Para investigar el origen de la energía extrema irradiada por supernovas superluminosas.
- Para identificar a los progenitores estelares responsables de estos transitorios energéticos.
- Para explicar las características espectrales observadas de SN 2006gy, particularmente sus líneas de hierro.
Principales métodos:
- Análisis espectral de SN 2006gy para identificar la composición elemental.
- Modelado de una supernova de tipo Ia que interactúa con el material circunstelar.
- Comparación de las curvas de luz modelo y espectros con datos de observación de SN 2006gy.
Principales resultados:
- Identificación de líneas de hierro neutras en el espectro de SN 2006gy, que indican una gran masa de hierro (0,3 masas solares) que se expande a alta velocidad (1500 km / s).
- Un modelo de una supernova estándar de tipo Ia que impacta con el material circunstelar reprodujo con éxito la curva de luz de SN 2006gy y el espectro dominado por el hierro de la época tardía.
- La evolución de la envolvente común en los sistemas binarios progenitor se propone como un mecanismo para sincronizar la eyección de la envolvente y la explosión de supernova.
Conclusiones:
- La interacción de una supernova de tipo Ia con material circunstelar proporciona una explicación viable para las propiedades observadas de SN 2006gy.
- La evolución de la envoltura común ofrece una vía potencial para los sistemas progenitores de estos transitorios brillantes.
- Este estudio arroja luz sobre los mecanismos que impulsan las supernovas superluminosas y sus sistemas progenitoras.
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